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diff --git a/lib/rand-isaac.h b/lib/rand-isaac.h
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+/* Bob Jenkins's cryptographic random number generator, ISAAC.
+
+   Copyright (C) 1999-2005 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1998, 1999 Colin Plumb.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+   Written by Colin Plumb.  */
+
+#ifndef RAND_ISAAC_H
+# define RAND_ISAAC_H
+
+# include <stdint.h>
+
+/* Size of the state tables to use.  ISAAC_LOG should be at least 3,
+   and smaller values give less security.  */
+# define ISAAC_LOG 8
+# define ISAAC_WORDS (1 << ISAAC_LOG)
+# define ISAAC_BYTES (ISAAC_WORDS * sizeof (uint32_t))
+
+/* RNG state variables.  The members of this structure are private.  */
+struct isaac_state
+  {
+    uint32_t mm[ISAAC_WORDS];	/* Main state array */
+    uint32_t iv[8];		/* Seeding initial vector */
+    uint32_t a, b, c;		/* Extra index variables */
+  };
+
+void isaac_seed (struct isaac_state *);
+void isaac_refill (struct isaac_state *, uint32_t[ISAAC_WORDS]);
+
+#endif